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Sanders campaign manager on momentum heading into Wisconsin, New York

| Democratic presidential candidate Bernie Sanders is hopeful he will win today's Wisconsin primary before focusing on the New York primary on April 19. Sanders is leading in a CBS News battleground tracker poll by 2 points over rival Hillary Clinton. This comes after a string of victories for the Sanders campaign in recent weeks. With more on the Sanders campaign's newfound momentum, his campaign manager Jeff Weaver joins CBSN.